You should always use 2 back flow preventers on wells and city water.
Reason, it is the law and you dont want to contaminate a well, poisons and such can get into water you may want to use for something else.
It wont be your land forever.
The reason for 2 is backup and they should be spring check type back flow preventers in line.
That's what licensed professionals have to do.
My cousins live on the Colorado river and farm wheat, they feel that the river belongs to them and they throw there used car batteries from the big pumps in the river.
Then they say the people that float the river are stupid because the river is nasty.
These people tick me off to no end.
Not accusing you of anything Jack just some thoughts on how some farmers feel.
Worth
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